From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B868FC072B1 for ; Tue, 28 May 2019 10:48:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 97E40208CB for ; Tue, 28 May 2019 10:48:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726663AbfE1KsG (ORCPT ); Tue, 28 May 2019 06:48:06 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:55177 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a24:5547:: with SMTP id e68mr2727057itb.83.1559040485433; Tue, 28 May 2019 03:48:05 -0700 (PDT) Date: Tue, 28 May 2019 03:48:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000532b860589f0669a@google.com> Subject: general protection fault in cdev_del From: syzbot To: andreyknvl@google.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=178e4526a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c309d28e15db39c5 dashboard link: https://syzkaller.appspot.com/bug?extid=67b2bd0e34f952d0321e compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10dc5d54a00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17cae526a00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+67b2bd0e34f952d0321e@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN PTI CPU: 1 PID: 2486 Comm: kworker/1:2 Not tainted 5.2.0-rc1+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:592 Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 93 a5 d5 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48 RSP: 0018:ffff8881d18e7218 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8881d249a100 RCX: ffffffff820d879e RDX: 000000000000000c RSI: ffffffff8167705d RDI: 0000000000000064 RBP: 0000000000000000 R08: ffff8881d18d1800 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881d25c9100 R14: 0000000000000000 R15: ffff8881cc2a8070 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35af318000 CR3: 00000001cc182000 CR4: 00000000001406e0 Call Trace: tty_unregister_device drivers/tty/tty_io.c:3192 [inline] tty_unregister_device+0x10d/0x1a0 drivers/tty/tty_io.c:3187 hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline] hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline] hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948 usb_probe_interface+0x30b/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x287/0x660 drivers/base/dd.c:509 driver_probe_device+0x104/0x210 drivers/base/dd.c:670 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:777 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:843 bus_probe_device+0x1e6/0x290 drivers/base/bus.c:514 device_add+0xae6/0x1700 drivers/base/core.c:2111 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0xa2/0x100 drivers/usb/core/driver.c:266 really_probe+0x287/0x660 drivers/base/dd.c:509 driver_probe_device+0x104/0x210 drivers/base/dd.c:670 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:777 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:843 bus_probe_device+0x1e6/0x290 drivers/base/bus.c:514 device_add+0xae6/0x1700 drivers/base/core.c:2111 usb_new_device.cold+0x8c1/0x1016 drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x1adc/0x35a0 drivers/usb/core/hub.c:5432 process_one_work+0x90a/0x1580 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x30e/0x420 kernel/kthread.c:254 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace 3b56fa5a205cba42 ]--- RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:592 Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 93 a5 d5 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48 RSP: 0018:ffff8881d18e7218 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8881d249a100 RCX: ffffffff820d879e RDX: 000000000000000c RSI: ffffffff8167705d RDI: 0000000000000064 RBP: 0000000000000000 R08: ffff8881d18d1800 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881d25c9100 R14: 0000000000000000 R15: ffff8881cc2a8070 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35af318000 CR3: 00000001cc182000 CR4: 00000000001406e0 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches